[rules-users] Drools documentation on 'from' with Hibernate queries
A section of the Drools documentation ends abruptly with the sentence: The next example shows how we can reason over the results of a hibernate query. The Restaurant pattern will reason over and bind with each result in turn: The rest could be found here: http://blog.athico.com/2007/06/chained-from-accumulate-collect.html Cheers Alexandre ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Drools low concurrency/high synchronization? !NOSIG!
Folks, I am currently trying to scale our implementation by farming out request into mutliple threads. I am on a 4 CPU Mac. A few things I am wondering about: 1. Although I see an increase in CPU load when going from single to multi-threaded processing the throughput increased marginally. I am pretty sure that my measurements are correct. I have checked the GC and this is not the source of congestion. My question here is whether Drools is using lot's of synchronization that may explain this. 2. When I share the RuleBase accross threads (which I think is valid?) I get interesting errors during execution. eg: org.drools.RuntimeDroolsException: Exception executing predicate [EMAIL PROTECTED] at org .drools .rule .PredicateConstraint.isAllowedCachedRight(PredicateConstraint.java:246) at org .drools .common .TripleBetaConstraints.isAllowedCachedRight(TripleBetaConstraints.java: 200) at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:150) at org .drools .reteoo .CompositeObjectSinkAdapter .propagateAssertObject(CompositeObjectSinkAdapter.java:318) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java: 153) at org.drools.reteoo.Rete.assertObject(Rete.java:175) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java: 192) at org .drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71) at org .drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java: 909) at org .drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java: 881) at org .drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java: 682) at .DroolsPD.validate(DroolsPD.java:66) at .DroolsMTRunner.run(DroolsMTRunner.java:30) at java.lang.Thread.run(Thread.java:552) Caused by: org.mvel.CompileException: cannot invoke getter: getSAClass [declr.class: xxx.AbstractSA; act.class: null] at org .mvel.optimizers.impl.refl.GetterAccessor.getValue(GetterAccessor.java: 52) at org .mvel .optimizers.impl.refl.VariableAccessor.getValue(VariableAccessor.java: 39) at org .mvel .ast .VariableDeepPropertyNode .getReducedValueAccelerated(VariableDeepPropertyNode.java:22) at org .mvel .ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:21) at org .mvel .ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21) at org.mvel.MVELRuntime.execute(MVELRuntime.java:88) at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111) at org.mvel.MVEL.executeExpression(MVEL.java:235) at org .drools .base .mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:36) at org .drools .rule .PredicateConstraint.isAllowedCachedRight(PredicateConstraint.java:240) ... 13 more Caused by: java.lang.NullPointerException at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source) at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25) at java.lang.reflect.Method.invoke(Method.java:324) at org .mvel.optimizers.impl.refl.GetterAccessor.getValue(GetterAccessor.java: 42) ... 22 more Details: * I use StatelessSessions which are private to the threads * No data is shared between threads (with the exception of the RuleBase, as outline above) * I am on JDK 1.5 I would be grateful for any pointers for 'correct' use of Drools in an MT environment. Cheers, Ingomar -- Ingomar Otter Chief Technology Officer mailto:[EMAIL PROTECTED] Mobile: +49 172 2367867 Valtech GmbH Bahnstraße 16 40212 Düsseldorf Germany Phone: +49 (0)211 179237-0 Fax: +49 211 179237-19 http://www.valtech.de Geschäftsführer: Ingo Kriescher Amtsgericht Düsseldorf HRB48672 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Drools low concurrency/high synchronization? !NOSIG!
Hi Ingomar, Which drools version are you using? We made improvements on 4.0.4, that fixes concurrency issues on mvel core, so if you aren't using it please do an update and try test against your environment. Please let me know if your problems go away when you upgrade. Thanks On Jan 22, 2008 11:13 AM, Ingomar Otter [EMAIL PROTECTED] wrote: Folks,I am currently trying to scale our implementation by farming out request into mutliple threads. I am on a 4 CPU Mac. A few things I am wondering about: 1. Although I see an increase in CPU load when going from single to multi-threaded processing the throughput increased marginally. I am pretty sure that my measurements are correct. I have checked the GC and this is not the source of congestion. My question here is whether Drools is using lot's of synchronization that may explain this. 2. When I share the RuleBase accross threads (which I think is valid?) I get interesting errors during execution. eg: org.drools.RuntimeDroolsException: Exception executing predicate [EMAIL PROTECTED] atorg.drools.rule.PredicateConstraint.isAllowedCachedRight( PredicateConstraint.java:246) at org.drools.common.TripleBetaConstraints.isAllowedCachedRight( TripleBetaConstraints.java:200) atorg.drools.reteoo.JoinNode.assertObject(JoinNode.java:150) atorg.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject( CompositeObjectSinkAdapter.java:318) atorg.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153) at org.drools.reteoo.Rete.assertObject(Rete.java:175) atorg.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192) at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java :71) at org.drools.common.AbstractWorkingMemory.insert( AbstractWorkingMemory.java:909) atorg.drools.common.AbstractWorkingMemory.insert( AbstractWorkingMemory.java:881) atorg.drools.common.AbstractWorkingMemory.insert( AbstractWorkingMemory.java:682) at.DroolsPD.validate(DroolsPD.java:66) at .DroolsMTRunner.run(DroolsMTRunner.java:30) at java.lang.Thread.run(Thread.java:552) Caused by: org.mvel.CompileException: cannot invoke getter: getSAClass [ declr.class: xxx.AbstractSA; act.class: null] atorg.mvel.optimizers.impl.refl.GetterAccessor.getValue( GetterAccessor.java:52) at org.mvel.optimizers.impl.refl.VariableAccessor.getValue( VariableAccessor.java:39) at org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated( VariableDeepPropertyNode.java:22) atorg.mvel.ast.PropertyASTNode.getReducedValueAccelerated( PropertyASTNode.java:21) at org.mvel.ast.BinaryOperation.getReducedValueAccelerated( BinaryOperation.java:21) at org.mvel.MVELRuntime.execute(MVELRuntime.java:88) at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111) atorg.mvel.MVEL.executeExpression(MVEL.java:235) at org.drools.base.mvel.MVELPredicateExpression.evaluate( MVELPredicateExpression.java:36) atorg.drools.rule.PredicateConstraint.isAllowedCachedRight( PredicateConstraint.java:240) ... 13 more Caused by: java.lang.NullPointerException atsun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source) atsun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) atjava.lang.reflect.Method.invoke(Method.java:324) at org.mvel.optimizers.impl.refl.GetterAccessor.getValue( GetterAccessor.java:42) ... 22 more Details: * I use StatelessSessions which are private to the threads * No data is shared between threads (with the exception of the RuleBase, as outline above) * I am on JDK 1.5 I would be grateful for any pointers for 'correct' use of Drools in an MT environment. Cheers, Ingomar Ingomar Otter Chief Technology Officer [EMAIL PROTECTED] Mobile: +49 172 2367867 Valtech GmbH Bahnstraße 16 40212 Düsseldorf Germany Phone: +49 (0)211 179237-0 Fax: +49 211 179237-19 www.valtech.de Geschäftsführer: Ingo Kriescher Amtsgericht Düsseldorf HRB48672 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Fernando Meyer http://fmeyer.org JBoss Rules Core Developer [EMAIL PROTECTED] ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] BRMS locks jackrabbit
Hi, we are trying to use Drools as a business rules engine and we have encountered some difficulties. First of all when we log into BRMS, the jackrabbit session is created and JCR is locked. This seems to be natural and of course it is correct but we need to communicate with repository from other applications which is not possible due to locking. Do you have any idea how to simply solve it? We have tried to sign out from the BRMS but is does not seem to work (to unlock the JCR). The solution could be to use jackrabbit in model 2 or 3, but we could not find any instructions how to configure BRMS to use these models. There is a configuration file components.xml in the BRMS WEB-INF folder which is used for configuring the repository, so is there any property or anything which could be used for configuring BRMS to use a JNDI to access the repository? From our point of view it seems that we will have to implement JCRRepositoryConfigurator and set property name=configuratoroutRepositoryConfigurator/property into the components.xml. Is it right? We are using Drools 4.0.3 and we deploy BRMS to Glassfigh V2 b58g. Thank you for your answers. Safi -- View this message in context: http://www.nabble.com/BRMS-locks-jackrabbit-tp15018752p15018752.html Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Drools low concurrency/high synchronization? !NOSIG!
This looks different to what was fixed in 4.0.4. I'm cc'ing brockm to get his feedback as it looks like an MVEL bug on accessors. Mark Fernando Meyer wrote: Hi Ingomar, Which drools version are you using? We made improvements on 4.0.4, that fixes concurrency issues on mvel core, so if you aren't using it please do an update and try test against your environment. Please let me know if your problems go away when you upgrade. Thanks On Jan 22, 2008 11:13 AM, Ingomar Otter [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Folks, I am currently trying to scale our implementation by farming out request into mutliple threads. I am on a 4 CPU Mac. A few things I am wondering about: 1. Although I see an increase in CPU load when going from single to multi-threaded processing the throughput increased marginally. I am pretty sure that my measurements are correct. I have checked the GC and this is not the source of congestion. My question here is whether Drools is using lot's of synchronization that may explain this. 2. When I share the RuleBase accross threads (which I think is valid?) I get interesting errors during execution. eg: org.drools.RuntimeDroolsException : Exception executing predicate [EMAIL PROTECTED] atorg.drools.rule.PredicateConstraint.isAllowedCachedRight( PredicateConstraint.java:246) at org.drools.common.TripleBetaConstraints.isAllowedCachedRight(TripleBetaConstraints.java:200) atorg.drools.reteoo.JoinNode.assertObject(JoinNode.java:150) atorg.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318) atorg.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153) at org.drools.reteoo.Rete.assertObject(Rete.java:175) atorg.drools.reteoo.ReteooRuleBase.assertObject (ReteooRuleBase.java:192) at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:909) atorg.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:881) atorg.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:682) at.DroolsPD.validate(DroolsPD.java:66) at .DroolsMTRunner.run(DroolsMTRunner.java:30) at java.lang.Thread.run(Thread.java:552) Caused by: org.mvel.CompileException: cannot invoke getter: getSAClass [declr.class: xxx.AbstractSA; act.class: null] atorg.mvel.optimizers.impl.refl.GetterAccessor.getValue( GetterAccessor.java:52) at org.mvel.optimizers.impl.refl.VariableAccessor.getValue(VariableAccessor.java:39) at org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:22) atorg.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:21) at org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21) at org.mvel.MVELRuntime.execute(MVELRuntime.java:88) at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111) atorg.mvel.MVEL.executeExpression(MVEL.java:235) at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:36) atorg.drools.rule.PredicateConstraint.isAllowedCachedRight(PredicateConstraint.java:240) ... 13 more Caused by: java.lang.NullPointerException atsun.reflect.GeneratedMethodAccessor6.invoke (Unknown Source) atsun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25) atjava.lang.reflect.Method.invoke( Method.java:324) at org.mvel.optimizers.impl.refl.GetterAccessor.getValue(GetterAccessor.java:42) ... 22 more Details: * I use StatelessSessions which are private to the threads * No data is shared between threads (with the exception of the RuleBase, as outline above) * I am on JDK 1.5 I would be grateful for any pointers for 'correct' use of Drools in an MT environment. Cheers, Ingomar Ingomar Otter Chief Technology Officer [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] Mobile: +49 172 2367867 Valtech GmbH Bahnstraße 16 40212 Düsseldorf Germany Phone: +49 (0)211 179237-0 Fax: +49 211 179237-19 www.valtech.de http://www.valtech.de/ Geschäftsführer: Ingo Kriescher Amtsgericht Düsseldorf HRB48672 ___ rules-users mailing list rules-users@lists.jboss.org mailto:rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Fernando Meyer http://fmeyer.org JBoss Rules Core Developer [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] ___ rules-users mailing list rules-users@lists.jboss.org
Re: [rules-users] OutOfMemory with BRMS 4.0.3
Hello michael, Is the rule agent running on a separate server to the brms? The initial configuration was: - BRMS in tomcat 5.5 - server with RuleAgent in Jboss AS 3.2.8 But now I moved to this configuration: - server with RuleAgent in Jboss AS 3.2.8 (unchanged) - BRMS is also in the same jboss instance And in both cases I have the problem. Is the rule agent actually running when the error happens? No I don't think so. I don't have any exception before I try to go to a web page (either of the BRMS, or of my other server in Jboss when the BRMS is in the same jboss instance), and then I get OufOfMemoryError: Java heap space. The RuleAgent is only instantiated when I send a specific request to my server (and I'm not even sure it was called once before the last crash). Also that is an old version of jboss as? yes, it's Jboss application server 3.2.8 (I think it is the last and only one in the 3.x series that works with JDK 1.5): I need to use an older version because of other compatibility issues of my server, but since I had exactly the same problem with Tomcat, I'm beginning to think it may not be linked to the server version ...? Regards, Sophie Michael Neale [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 22/01/2008 11:31 Please respond to Rules Users List rules-users@lists.jboss.org To Rules Users List rules-users@lists.jboss.org cc Rules Users List rules-users@lists.jboss.org Subject Re: [rules-users] OutOfMemory with BRMS 4.0.3 Thanks sophie. A few more questions to narrow this down. Is the rule agent running on a separate server to the brms? Is the rule agent actually running when the error happens? Also that is an old version of jboss as? I guess the rest depends on your answers to the above. Let me know. Michael Sent from my iPhone On 21/01/2008, at 23:03, [EMAIL PROTECTED] wrote: Hello again, After coming back after almost a week without touching the server, the jboss application server with the BRMS also makes a OutOfMemory exception when I try to use the BRMS. When you get back to work if you could provide more info it would be great. What kind of info do you need? Here is what is done in my server code, to fire the rules: Properties props=new Properties(); props.setProperty(newInstance, false); props.setProperty(url, packageURL); props.setProperty(localCacheDir, cacheDir); props.setProperty(poll, 30); props.setProperty(name, Agent-+pid); RuleAgent agent = RuleAgent.newRuleAgent(props); RuleBase rb = agent.getRuleBase(); workingMemory=ruleBase.newStatefulSession(); and then we insert all objects in the working memory with wm.insert (o);, but recursively in order for all the objects to be directly accessible in rules (We've got a hierarchic structure, an XML file transformed in Java by JAXB, so the insert method tests the accessor methods of the object and is called recursively on the accessors' results, before inserting the object). then we call: workingMemory.fireAllRules(); [...interprate results...] workingMemory.dispose(); Best regards, Sophie Michael Neale [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 17/01/2008 23:34 Please respond to Rules Users List rules-users@lists.jboss.org To Rules Users List rules-users@lists.jboss.org cc Rules Users List rules-users@lists.jboss.org Subject Re: [rules-users] OutOfMemory with BRMS 4.0.3 Thanks sophie. Any oome I will investigate it just takes time to find them. I have been running some overnight tests myself today. When you get back to work if you could provide more info it would be great. If the agent is running then it polls the brms. So that could be one of the possible causes. Sent from my iPhone On 17/01/2008, at 22:44, [EMAIL PROTECTED] wrote: Hi Michael, I'm not at my company these days so I cannot check or make further tests. But yes, we use a rule agent and an URL to query the rule. And it happens after 1-2 days whether we use the system or not, it doesn't seem to make any difference. however, I'll check when returning, but I think it still worked after a few days, now that I have moved the BRMS to the Jboss 3.2.3 app server. thanks for trying to help me! Sophie [EMAIL PROTECTED] wrote: - To: Rules Users List rules-users@lists.jboss.org From: Michael Neale [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] Date: 01/17/2008 12:52AM Subject: Re: [rules-users] OutOfMemory with BRMS 4.0.3 Hi Sophie - how is the jboss runtime server querying this? via the rule agent (and a URL)? just trying to work out what the usage pattern is so we can reproduce it. Michael. On Jan 11, 2008 12:20 AM, [EMAIL PROTECTED] wrote: Hello, I am using Drools BRMS 4.0.3 with tomcat 5.5.25, and I get OutOfMemory exceptions in tomcat regularly. I recently changed the java option of tomcat to add -Xmx512m, but it only resulted in taking a little more time before crashing (3 days, instead of 1 before).
Re: [rules-users] BRMS locks jackrabbit
safi wrote: Hi, we are trying to use Drools as a business rules engine and we have encountered some difficulties. First of all when we log into BRMS, the jackrabbit session is created and JCR is locked. This seems to be natural and of course it is correct but we need to communicate with repository from other applications which is not possible due to locking. Do you have any idea how to simply solve it? One option is to remote against the SEAM RCP api for the BRMS, rather than Jackrabbit directly. Mic will be online later and might be able to shed more light on this. We have tried to sign out from the BRMS but is does not seem to work (to unlock the JCR). The solution could be to use jackrabbit in model 2 or 3, but we could not find any instructions how to configure BRMS to use these models. There is a configuration file components.xml in the BRMS WEB-INF folder which is used for configuring the repository, so is there any property or anything which could be used for configuring BRMS to use a JNDI to access the repository? From our point of view it seems that we will have to implement JCRRepositoryConfigurator and set property name=configuratoroutRepositoryConfigurator/property into the components.xml. Is it right? We are using Drools 4.0.3 and we deploy BRMS to Glassfigh V2 b58g. Thank you for your answers. Safi ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] How to fire just one rule in a .drl.
I am trying to set up a set of unit tests for the set of rules in a .drl file. How can you fire just one rule in a .drl packaqe. Cheers, Blair ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] How to fire just one rule in a .drl.
For unit tests, you can use agenda filters. []s Edson 2008/1/22, Christie, Blair [EMAIL PROTECTED]: I am trying to set up a set of unit tests for the set of rules in a .drl file. How can you fire just one rule in a .drl packaqe. Cheers, Blair ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Drools and Spring Integration
I've had no feedback on the dev mailing list about this, so thought I'd mention it here. If you want strong spring/guice integration with Drools please do get involved in this project and if they mature well enough we'll include them as part of the standard distro. http://blog.athico.com/2008/01/drools-and-spring-integration.html Mark ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] can i reuse rulebase
jack wu wrote: my profiler shows that it takes the same amount of time to do: final RuleBase ruleBase = RuleBaseFactory.newRuleBase( RuleBase.RETEOO, conf ); as to do: session.executeWithResults(); i am wondering if i can cache the ruleBase and do addPackage() and removePackage() for each executeWithResults(). the ducmentation says always create a new ruleBase. so i am kind of confused. thanks for the help. Yes you can do this, but it's not thread safe (unlike stateful sessions). The stateless session could be propagating data mid change and thus leaving the network invalid. So if you do this, which is not recommended practice, do make sure that you know that there are currently no valid executing sessions for that RuleBase. thanks. Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://us.rd.yahoo.com/evt=51734/*http://tools.search.yahoo.com/newsearch/category.php?category=shopping ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] package deserialize improvements
jack wu wrote: i remember seeing some one mentioning org.drools.rule.Package serialization is slow and there are some improvement code coming in. is that code already in the code base? thanks. No that is not there. Simon Harris, an old school drools hacker, has looked into it and believes he can get 10x speed improvements. However his free time, due to a baby on the way, will not accomodate this work - so he is waiting for someone to sponsor this work. Mark jack. Never miss a thing. Make Yahoo your homepage. http://us.rd.yahoo.com/evt=51438/*http://www.yahoo.com/r/hs ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
